The report discusses the organization of a distributed control system based on continuous logic. The proposed solutions expand the capabilities of cyber-physical systems by increasing their performance and reliability...
The report discusses the organization of a distributed control system based on continuous logic. The proposed solutions expand the capabilities of cyber-physical systems by increasing their performance and reliability while reducing energy consumption. Promising areas of application are analogue automatic control systems for microelectromechanical and microelectronic devices. The work is aimed at the development of analog computing in the direction of transition to the creation of distributed analog computing structures that continuously synthesize control signals in real time. In analog cyber-physical networks, the temporal gap between physical and computational processes is eliminated. To create hardware control algorithms in real time, continuum logic of interaction between analogue control devices is used. Examples of the use of analogue automatic in robot control systems are given.
The article is dedicated to the study of peculiarities of the behavior of the envelope and instantaneous frequency of the CFSK-n-signal at the output of channel with memory caused by it frequency selective properties....
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The article is dedicated to the study of peculiarities of the behavior of the envelope and instantaneous frequency of the CFSK-n-signal at the output of channel with memory caused by it frequency selective properties. New properties and phenomena are revealed that allow to increase the efficiency of communication systems with this type of signals, built on the basis of the theory of resolution time.
The problem of increasing the noise-proof feature of communication systems, along with increasing the communication channel capacity, is currently important. In many areas of wireless engineering (in radiolocation and...
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The problem of increasing the noise-proof feature of communication systems, along with increasing the communication channel capacity, is currently important. In many areas of wireless engineering (in radiolocation and communications for example), it becomes necessary to receive and process signals, some characteristics of which (for example, amplitude, frequency, or initial phase) are unknown. Methods of statistical radio engineering, as well as algorithms for blind signal processing, can be used to eliminate a priori uncertainty. The problem of comparative analysis of some common algorithms for blind signal processing in the tasks of separating radio signals from mixtures with interference and noise was considered. In the study, the algorithms JADE, FastICA, SOBI and AMUSE were considered. Amplitude-, frequency- and phase-shift keyed signals against the background of additive noise, impulse noise and cochannel noise were considered as useful signals. Based on the results of simulation modeling, the effectiveness of these algorithms is compared when distinguishing between several types of signals in the presence of various types of interference. The above research results can be useful when choosing a blind processing algorithm for subsequent practical application.
This article deals with the generating of pseudo-random Gordon-Mills-Welch sequences with good autocorrelation properties for use in communication and data transmission systems, as spectrum-expanding sequences, scramb...
This article deals with the generating of pseudo-random Gordon-Mills-Welch sequences with good autocorrelation properties for use in communication and data transmission systems, as spectrum-expanding sequences, scrambling and synchronization functions. Nowadays, there is a significant issue of pure detecting of signals in various types of radio channel. The proper solution of this issue provides new opportunities in the future research. The most important aim of usage of pseudo-random sequences is the reducing of influence of negative effects of channel and maximizing the probability of detecting the low-rate signal because of the unique form of autocorrelation function. Due to this feature, they are commonly used in the area of radars. The main goal of the article is to find out the exact types of Gordon-Mills-Welch sequences with suitable autocorrelation properties.
The article discusses the use of continuous processors to generate analog signals of a given shape in a continuous time interval. The purpose of the development is to create built-in devices for monitoring signal para...
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The article discusses the use of continuous processors to generate analog signals of a given shape in a continuous time interval. The purpose of the development is to create built-in devices for monitoring signal parameters for radio engineering systems. The main element of the generator is an analog function interpolator controlled by continuous processors. The generator's operation is based on the approximation of signal functions by its tabulated values. The signal is synthesized at conjugate time intervals by the method of forming a spline model of the function. To calculate the spline coordinates, the polynomials of Newton, Bessel and Stirling are used. The proposed approach makes it possible to create small-sized devices for synthesizing signals of a given shape using analog elements.
The aspects of mathematical modeling of the dynamics of complex processes in complex onboardsystems are considered. The structural connections between the elements of modeled systems and their dynamics are formalized...
The aspects of mathematical modeling of the dynamics of complex processes in complex onboardsystems are considered. The structural connections between the elements of modeled systems and their dynamics are formalized using a system of differential equations. Qualitative analysis of the synthesized model allowed establishing new non-local conditions for stable functioning of modeled combined onboardsystems. The results obtained make it possible to expand the working areas of technical devices and the devices included in onboardsystems.
A well-known complex of methods for converting signals into binary digital form is shown, potential theoretically achievable boundaries of such conversions are determined. Values are calculated that indicate the value...
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A well-known complex of methods for converting signals into binary digital form is shown, potential theoretically achievable boundaries of such conversions are determined. Values are calculated that indicate the value of the code distance between the original values and those obtained after transformation. Euclidean space metric. A correspondence is established between these messages and binary code combinations in the Hamming space. It is proved that in some cases the values that determine the distance between messages and the metric are quite general and should be clarified for specific situations. Distortion minimization is suitable for cases where the minimum code distances of the primary metric space are related to the minimum code distances of the secondary metric space. And also in the article the admissible limits of such minimization are found.
Modelling of multipath signal propagation at 1.9 MHz has been carried out for different locations of reradiating objects relative to the transmitting antenna. Objects in the form of a vertical rod, a mast, a flat...
Modelling of multipath signal propagation at 1.9 MHz has been carried out for different locations of reradiating objects relative to the transmitting antenna. Objects in the form of a vertical rod, a mast, a flat screen and towers of various shapes are considered. It has been shown that distortions of the phase radiation pattern of more than 10 degrees can appear at distances between the reflecting object and the antenna up to 500 m or more. The object height and shape are of great importance.
The article is devoted to the development of signal-code structures (SCC) for low-energy broadband radio links. The SCC is based on multi-frequency signals with a continuous phase (M-Cpfsk) and non-binary error-correc...
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The article is devoted to the development of signal-code structures (SCC) for low-energy broadband radio links. The SCC is based on multi-frequency signals with a continuous phase (M-Cpfsk) and non-binary error-correcting codes (Non-binary low-density parity-check and turbo-like). An analysis is made of signal-code structures for bands up to 10 MHz with different parameters. These signal-code structures can be used for command-telemetry radio links from unmanned aerial vehicle (UAVs).
This article examines the consequences of a large number of vehicles and their impact on the environment and creating a smart city to solve the transport problems of the megapolis. During the study, it was found out t...
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This article examines the consequences of a large number of vehicles and their impact on the environment and creating a smart city to solve the transport problems of the megapolis. During the study, it was found out that at the moment the most dangerous impact from the car on the environment are: the consequences of an accident; emissions of harmful substances; thermal effects; noise; vibration; wear products; problems of recycling. One of the ways to solve the problem of environmental pollution can be the development of recuperation energy in road transport.
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